Vanguard Total Stock Market Index Fund (VITSX) is an open-end mutual fund that seeks to track the performance of the CRSP US Total Market Index, providing broad exposure to the entire investable U.S. stock market, including large-, mid-, small-, and micro-cap stocks. The fund employs a passive management strategy through full replication or representative sampling, investing at least 80% of its assets in common stocks included in the index; it offers daily liquidity, automatic dividend reinvestment, and low-cost institutional share class pricing with an expense ratio of approximately 0.04%. Managed by The Vanguard Group, Inc., founded in 1975 and headquartered in Malvern, Pennsylvania, the fund operates globally through Vanguard's network but focuses primarily on U.S. equity markets, serving long-term investors such as retirement plans, endowments, and individual accounts seeking diversified market returns. In recent years, Vanguard has expanded its offerings with the launch of related low-cost index products, including enhancements to ESG-screened variants and increased assets under management surpassing $1.5 trillion for VITSX amid strong inflows; notable strategic shifts include Vanguard's 2024 adoption of a more active role in corporate governance proxy voting and partnerships with fintech platforms for improved retail access, alongside no major acquisitions or name changes as of late 2025.